Ad abolendam (lit. 'On abolition / Towards abolishing'; full title in Latin: Ad abolendam diversam haeresium pravitatem, lit. 'To abolish diverse malignant heresies') was a decretal and bull of Pope Lucius III, written at Verona and issued 4 November 1184. It was issued after the Council of Verona settled some jurisdictional differences between the Papacy and Frederick I, Holy Roman Emperor. The document prescribes measures to uproot heresy and sparked the efforts which culminated in the Albigensian Crusade and the Inquisitions. Its chief aim was the complete abolition of Christian heresy.
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Ad abolendam in the context of Pope Gregory IX
Pope Gregory IX (Latin: Gregorius IX; born Ugolino di Conti; 1145 – 22 August 1241) was head of the Catholic Church and the ruler of the Papal States from 19 March 1227 until his death in 1241. He is known for issuing the Decretales and instituting the Papal Inquisition, in response to the failures of the episcopal inquisitions established during the time of Pope Lucius III, by means of the papal bull Ad abolendam, issued in 1184.
He worked initially as a cardinal, and after becoming the successor of Honorius III, he fully inherited the traditions of Gregory VII and of his own cousin Innocent III, and zealously continued their policy of papal supremacy.